Toward understanding the lithiation/delithiation process in Fe0.5TiOPO4/C electrode material for lithium-ion batteries

Abstract : Fe0.5TiOPO4/C composite was used as anode material for LIB and exhibits excellent cycling performance when the electrode is cycled in two different voltage ranges [3.0–1.3 V] and [3.0–0.02 V] where different insertion mechanisms were involved. A detailed in situ XANES spectroscopy study coupled to the electrochemical analyses, clearly established that the structure of Fe0.5TiOPO4/C electrode materials is preserved when cycled between 3.0 and 1.3 V. Furthermore, a formation of new phase at the end of first discharge was evidenced, with a reversible capacity of 100 mA h g−1 after 50 cycles at C/5 rate. At highly lithiated states, [3.0–0.02 V] voltage range, a reduction-decomposition reaction highlights the Li-insertion/extraction behaviors, and low phase crystallinity is observed during cycling, in addition an excellent rate behavior and a reversible capacity of 250 mA h g−1 can still be maintained after 50 cycles at high cycling rate 5C.
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Submitted on : Tuesday, March 29, 2016 - 1:58:53 PM
Last modification on : Friday, August 9, 2019 - 3:18:07 PM

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Karima Lasri, Abdelfattah Mahmoud, Ismael Saadoune, Sougrati Moulay-Tahar, Lorenzo Stievano, et al.. Toward understanding the lithiation/delithiation process in Fe0.5TiOPO4/C electrode material for lithium-ion batteries. Solar Energy Materials and Solar Cells, Elsevier, 2016, 148, pp.11-19. ⟨10.1016/j.solmat.2015.11.021⟩. ⟨hal-01294526⟩

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